The jugular vein is a major blood vessel located in the neck that carries deoxygenated blood from the head and neck back to the heart. There are two main types: the internal jugular vein, which drains blood from the brain, face, and neck, and the external jugular vein, which drains blood from the outer structures of the head. These veins play a crucial role in the circulatory system, ensuring that blood is efficiently returned to the heart for reoxygenation. The jugular veins are often used in medical procedures, such as inserting a central venous catheter, due to their accessibility and size.